Charles Spurgeon Commentary Revelation 12:9

"And the great dragon was cast down, the old serpent, he that is called the Devil and Satan, the deceiver of the whole world; he was cast down to the earth, and his angels were cast down with him." — Revelation 12:9 (ASV)

This was done in former times as a matter of fact. It is done continually, spiritually, as Christ is lifted up, and his gospel gets the victory.